Segment Information - Segment Results and Operating Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating revenues by products and services
Segment revenue	$ 3,290	$ 3,738
Cost of services and products	1,652	1,817
Selling, general and administrative	823	721
Business
Operating revenues by products and services
Segment revenue	2,591	2,968
Cost of services and products	739	830
Selling, general and administrative	497
Selling, general and administrative		543
Total segment expense	1,236	1,373
Total segment adjusted EBITDA	1,355	1,595
Mass Markets
Operating revenues by products and services
Segment revenue	699	770
Cost of services and products	17	21
Selling, general and administrative	306
Selling, general and administrative		335
Total segment expense	323	356
Total segment adjusted EBITDA	$ 376	$ 414